Immunoglobulin G Subclasses Panel

Test Code

Alias/See Also
IgG Subclasses

CPT Codes
82787(4), 82784

IgG Subclass 1(5425), IgG Subclass 2(5426), IgG Subclass 3(5427), IgG Subclass 4(5428)and Total IgG

Preferred Specimen
2 mL Serum

Minimum Volume
1.5 mL serum

SST or Red top: Avoid hemolysis. Invert a minimum of 5 times, then allow to clot in an upright position for 30 minutes. Centrifuge the the tube for at least 10 minutes. Keep tightly stoppered.

Transport Container
SST (speckled top tube) or Red top

Transport Temperature
Room Temperature

Specimen Stability
Room Temperature = 24 hours
Refrigerated = 7 days
Frozen = at least 7 days

Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Hemolysis and Lipemia


Setup Schedule
Monday and Thursday

Report Available
3 days

Clinical Significance
Increased IgG is associated with acute and chronic inflammations, monoclonal IgG myeloma, autoimmune diseases; decreased IgG is found in selective IgG deficiency, Bruton's Disease, and acquired immune deficiency.

Performing Laboratory
CompuNet Clinical Laboratories, LLC
2308 Sandridge Drive
Moraine, OH 45439

The CPT Codes provided in this document are based on AMA guidelines and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payor being billed. Any Profile/panel component may be ordered separately. Reflex tests are performed at an additional charge.